准噶尔盆地钻井岩心火山碎屑岩锆石U-Pb定年、微量元素及Hf同位素研究
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国家教育部回国人员科研启动基金,国家教育部博士点基金


Zircon U-Pb, trace element and Hf isotopes of pyroclastic rocks from the drilling cores in the Junggar Basin
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    摘要:

    对准噶尔盆地陆梁隆起中北部Db1井和Y1井巴塔玛依内山组火山(碎屑)岩,进行了单颗粒锆石的LA-ICP-MS U-Pb年龄和微量元素的同时测定以及Hf同位素系统分析。锆石内部结构、Th/U比值、稀土配分模式显示,锆石属于岩浆锆石。结果显示:(1)所测两组锆石样品最小年龄组的加权平均年龄都显示为晚石炭早期,可代表该组地层的形成时代;(2)锆石U-Pb年龄显示有中、晚元古代的1447~1410Ma、885~559Ma以及古生代早中期536~420Ma、401~360Ma、359~303Ma的年龄记录,指示准噶尔盆地经历了多阶段复杂陆壳形成演化过程;(3)锆石微量元素分析表明,盆地中北部前二叠纪基底主体属于由花岗岩、(歪碱)正长岩、玄武岩和辉长岩组成的花岗岩和中基性岩侵入型活动陆壳基底;(4)锆石Hf同位素分析显示,锆石年龄都具有正的εHf(t)值(+4.6~+19.0),推测锆石母岩源区至少存在两种物质源区贡献,岩浆上升-侵位过程中混染了古老基底物质组分。

    Abstract:

    Simultaneous in-situ analyses of single zircon LA-ICP-MS U-Pb age and trace elements and Hf isotope systematic analysis from the Batamayineishan Formation. The volcanic rock was obtained from drill well Db1 and Y1 on the north-central Luliang uplift within the Junggar Basin. The internal structure of zircon,Th/U ratios, REE patterns show that all samples are magmatic zircon. The results showed that: (1) weighted average age of the youngest age group is interpreted as the formation age of the studied formation by measured the two zircon samples, that is early Late Carboniferous;(2) zircon U-Pb ages display Mid-Late Proterozoic 1447~1410Ma,885~559Ma and the age record from early or middle Paleozoic 536~420Ma, 401~360Ma, 359~303Ma, indicating that the Junggar Basin experienced a complex of continental crust formation and evolution of the multi-stage process; (3) trace elements of zircon suggest that the basement of north-central Junggar basin in pre-Permian is composed of granite and mafic intrusive activity continental basement by granite, (larvikite)syenite, basalt and dolerite; (4) zircon Hf isotope analysis showed that εHf(t) values have a relatively great variation ranging from +4.6 to +19.0, demonstrating that at least two source materials have contributed to the zircon host rock generation, suggesting that magma rise and emplacement process was contaminated by ancient basement material components.

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杨甫,陈刚,侯斌,张甲明,胡延旭,黄得顺.2014.准噶尔盆地钻井岩心火山碎屑岩锆石U-Pb定年、微量元素及Hf同位素研究[J].地质学报,88(6):1068-1080.
yangfu, chengang, Houbin, Zhangjiaming, Huyanxu, Huangdeshun.2014. Zircon U-Pb, trace element and Hf isotopes of pyroclastic rocks from the drilling cores in the Junggar Basin[J]. Acta Geologica Sinica,88(6):1068-1080.

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  • 收稿日期:2012-09-20
  • 最后修改日期:2013-09-10
  • 录用日期:2014-06-24
  • 在线发布日期: 2014-07-08
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